1/*
2 * arch/arm/plat-omap/include/mach/uncompress.h
3 *
4 * Serial port stubs for kernel decompress status messages
5 *
6 * Initially based on:
7 * linux-2.4.15-rmk1-dsplinux1.6/arch/arm/plat-omap/include/mach1510/uncompress.h
8 * Copyright (C) 2000 RidgeRun, Inc.
9 * Author: Greg Lonnon <glonnon@ridgerun.com>
10 *
11 * Rewritten by:
12 * Author: <source@mvista.com>
13 * 2004 (c) MontaVista Software, Inc.
14 *
15 * This file is licensed under the terms of the GNU General Public License
16 * version 2. This program is licensed "as is" without any warranty of any
17 * kind, whether express or implied.
18 */
19
20#include <linux/types.h>
21#include <linux/serial_reg.h>
22
23#include <asm/memory.h>
24#include <asm/mach-types.h>
25
26#include "serial.h"
27
28#define MDR1_MODE_MASK			0x07
29
30volatile u8 *uart_base;
31int uart_shift;
32
33/*
34 * Store the DEBUG_LL uart number into memory.
35 * See also debug-macro.S, and serial.c for related code.
36 */
37static void set_omap_uart_info(unsigned char port)
38{
39	/*
40	 * Get address of some.bss variable and round it down
41	 * a la CONFIG_AUTO_ZRELADDR.
42	 */
43	u32 ram_start = (u32)&uart_shift & 0xf8000000;
44	u32 *uart_info = (u32 *)(ram_start + OMAP_UART_INFO_OFS);
45	*uart_info = port;
46}
47
48static void putc(int c)
49{
50	if (!uart_base)
51		return;
52
53	/* Check for UART 16x mode */
54	if ((uart_base[UART_OMAP_MDR1 << uart_shift] & MDR1_MODE_MASK) != 0)
55		return;
56
57	while (!(uart_base[UART_LSR << uart_shift] & UART_LSR_THRE))
58		barrier();
59	uart_base[UART_TX << uart_shift] = c;
60}
61
62static inline void flush(void)
63{
64}
65
66/*
67 * Macros to configure UART1 and debug UART
68 */
69#define _DEBUG_LL_ENTRY(mach, dbg_uart, dbg_shft, dbg_id)		\
70	if (machine_is_##mach()) {					\
71		uart_base = (volatile u8 *)(dbg_uart);			\
72		uart_shift = (dbg_shft);				\
73		port = (dbg_id);					\
74		set_omap_uart_info(port);				\
75		break;							\
76	}
77
78#define DEBUG_LL_OMAP7XX(p, mach)					\
79	_DEBUG_LL_ENTRY(mach, OMAP1_UART##p##_BASE, OMAP7XX_PORT_SHIFT,	\
80		OMAP1UART##p)
81
82#define DEBUG_LL_OMAP1(p, mach)						\
83	_DEBUG_LL_ENTRY(mach, OMAP1_UART##p##_BASE, OMAP_PORT_SHIFT,	\
84		OMAP1UART##p)
85
86static inline void arch_decomp_setup(void)
87{
88	int port = 0;
89
90	/*
91	 * Initialize the port based on the machine ID from the bootloader.
92	 * Note that we're using macros here instead of switch statement
93	 * as machine_is functions are optimized out for the boards that
94	 * are not selected.
95	 */
96	do {
97		/* omap7xx/8xx based boards using UART1 with shift 0 */
98		DEBUG_LL_OMAP7XX(1, herald);
99		DEBUG_LL_OMAP7XX(1, omap_perseus2);
100
101		/* omap15xx/16xx based boards using UART1 */
102		DEBUG_LL_OMAP1(1, ams_delta);
103		DEBUG_LL_OMAP1(1, nokia770);
104		DEBUG_LL_OMAP1(1, omap_h2);
105		DEBUG_LL_OMAP1(1, omap_h3);
106		DEBUG_LL_OMAP1(1, omap_innovator);
107		DEBUG_LL_OMAP1(1, omap_osk);
108		DEBUG_LL_OMAP1(1, omap_palmte);
109		DEBUG_LL_OMAP1(1, omap_palmz71);
110
111		/* omap15xx/16xx based boards using UART2 */
112		DEBUG_LL_OMAP1(2, omap_palmtt);
113
114		/* omap15xx/16xx based boards using UART3 */
115		DEBUG_LL_OMAP1(3, sx1);
116	} while (0);
117}
118